pepM Is an essential gene in Salmonella typhimurium
1989
Miller, C.G. | Kukral, A.M. | Miller, J.L. | Rao Movva, N.
The pepM gene of Salmonella typhimurium codes for a methionine-specific aminopeptidase that removes N-terminal methionine residues from proteins. This gene was inactivated in vitro by the insertion of a DNA fragment coding for kanamycin resistance. The inactivated gene could not replace the wild-type chromosomal pepM gene unless another functional copy was present in the cell. The lethal effect of the pepM insertion was not a result of polarity on any gene downstream, nor was it affected by the presence or absence of other peptidases.
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